:root {
  color-scheme: dark;
  --bg: #08111f;
  --panel: rgba(9, 19, 37, 0.88);
  --panel-strong: #122240;
  --line: rgba(157, 185, 255, 0.18);
  --text: #e9f1ff;
  --muted: #9fb3d9;
  --accent: #7dd3fc;
  --accent-2: #fbbf24;
  --good: #34d399;
  --danger: #fb7185;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  background: radial-gradient(circle at top, #17315f 0%, #08111f 52%, #050914 100%);
  color: var(--text);
}
button { font: inherit; }
.app {
  width: min(1120px, calc(100% - 24px));
  margin: 0 auto;
  padding: 20px 0 36px;
}
.topnav {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--muted);
}
.topnav a { color: inherit; text-decoration: none; }
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
}
.hero {
  padding: 20px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
}
.eyebrow, .label {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  color: var(--muted);
}
.hero h1, .side-panel h2 { margin: 6px 0; }
.subtitle, .brief, .tips { color: #dbe7ff; }
.hero-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.primary, .ghost, .pulse {
  border-radius: 16px;
  border: 1px solid var(--line);
  padding: 12px 16px;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, opacity 0.15s ease;
}
.primary { background: linear-gradient(135deg, #fbbf24, #f59e0b); color: #221400; font-weight: 700; }
.ghost, .pulse { background: rgba(255,255,255,0.04); color: var(--text); }
button:hover:not(:disabled) { transform: translateY(-1px); border-color: rgba(157,185,255,0.45); }
button:disabled { opacity: 0.45; cursor: default; }
.layout {
  margin-top: 18px;
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
}
.board-panel, .side-panel { padding: 18px; }
.statusbar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 18px;
}
.statusbar > div, .inset {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 12px 14px;
}
.controls-grid {
  display: grid;
  grid-template-columns: 64px minmax(260px, 1fr) 64px;
  grid-template-rows: 64px minmax(260px, 1fr) 64px;
  gap: 10px;
  align-items: stretch;
}
.pulse { font-size: 1.6rem; font-weight: 700; }
.pulse-up { grid-column: 2; grid-row: 1; }
.pulse-left { grid-column: 1; grid-row: 2; }
.pulse-right { grid-column: 3; grid-row: 2; }
.pulse-down { grid-column: 2; grid-row: 3; }
.board {
  grid-column: 2;
  grid-row: 2;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  aspect-ratio: 1;
}
.cell {
  position: relative;
  border-radius: 20px;
  border: 1px solid rgba(164, 191, 255, 0.16);
  background: linear-gradient(180deg, rgba(20, 35, 67, 0.96), rgba(9, 18, 34, 0.96));
  overflow: hidden;
}
.cell.wall::before {
  content: "";
  position: absolute;
  inset: 20%;
  border-radius: 14px;
  background: repeating-linear-gradient(135deg, #6b7280 0 8px, #94a3b8 8px 16px);
}
.cell.exit::after {
  content: "";
  position: absolute;
  inset: 12%;
  border: 2px dashed rgba(52, 211, 153, 0.9);
  border-radius: 16px;
  box-shadow: 0 0 18px rgba(52, 211, 153, 0.45);
}
.token, .pickup {
  position: absolute;
  display: grid;
  place-items: center;
}
.token {
  inset: 19%;
  border-radius: 999px;
  border: 2px solid rgba(255,255,255,0.6);
  font-size: 1.35rem;
  box-shadow: 0 10px 20px rgba(0,0,0,0.28);
}
.token.gold { background: linear-gradient(145deg, #fcd34d, #f59e0b); color: #311900; }
.token.teal { background: linear-gradient(145deg, #67e8f9, #0891b2); }
.token.coral { background: linear-gradient(145deg, #fda4af, #fb7185); }
.pickup {
  right: 8px;
  top: 8px;
  width: 24px;
  height: 24px;
  border-radius: 8px;
  background: linear-gradient(145deg, #fde68a, #facc15);
  color: #3b2500;
  font-size: 0.9rem;
  font-weight: 800;
}
.message {
  min-height: 48px;
  margin: 16px 4px 0;
  color: #dce8ff;
}
.tips { padding-left: 18px; line-height: 1.55; }
.legend {
  display: grid;
  gap: 10px;
}
.legend span { display: flex; gap: 10px; align-items: center; color: #d8e5ff; }
.swatch {
  width: 18px;
  height: 18px;
  border-radius: 6px;
  display: inline-block;
  border: 1px solid rgba(255,255,255,0.25);
}
.swatch.gold { background: #fbbf24; }
.swatch.teal { background: #22d3ee; }
.swatch.coral { background: #fb7185; }
.swatch.battery { background: #fde047; }
.swatch.exit { background: #34d399; }
.swatch.wall { background: #94a3b8; }
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .app { width: min(100% - 16px, 1120px); padding-top: 14px; }
  .hero { padding: 16px; }
  .controls-grid {
    grid-template-columns: 52px minmax(0, 1fr) 52px;
    grid-template-rows: 52px minmax(0, 1fr) 52px;
  }
  .board { gap: 6px; }
  .cell { border-radius: 16px; }
  .token { font-size: 1.1rem; }
}